Plc & Scada

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  • 1. Manda Institute of Technology Raisar, Bikaner TOPIC 1. PLC 2. SCADA -Submitted by Mahendra Bhakar EC IV Year
  • 2. What is Programmable Logic Controller (PLC) ?? Definition: A PLC is a digital operating electronic apparatus which uses a programmable memory for internal storage of instruction for implementing specific function such as logic, sequencing, timing, counting and arithmetic to control through analog or digital input/output modules various types of machines or process.
  • 3. Historical Background: In 1968, a group of engineers from General Motors developed the concept of PLC with an initial specification. The PLC must be: i . Easy to program. ii. Not need rewiring the control system if change the program. iii. Smaller in size, cheaper and high reliability. iv. simple construction and low maintenance v. Cost- competitive
  • 4. Simple PLC digital inputs network analog inputs / outputs digital outputs
  • 5. Major Components of a Common PLC POWER SUPPLY From SENSORS I M N O P D U U T L E PROCESSOR Pushbuttons, contacts, limit switches, etc. PROGRAMMING DEVICE O U T P U T M O D U L E To OUTPUT Solenoids, contactors, alarms etc.
  • 6. Leading Brands Of PLC AMERICAN: 1. 2. 3. 4. 5. 6. 7. Allen Bradley Gould Modicum Texas Instruments General Electric Westinghouse Cutter Hammer Square D EUROPEAN: 1. 2. 3. 4. Siemens Klockner & Mouller Festo Telemechanique
  • 7. Leading Brands Of PLC JAPANESE: 1. 2. 3. 4. Toshiba Omron Fanuc Mitsubishi
  • 8. Areas of Application Manufacturing / Machining Food / Beverage Metals Power Mining Petrochemical / Chemical
  • 9. PLC Size 1. SMALL - it covers units with up to 128 I/O’s and memories up to 2 Kbytes. - these PLC’s are capable of providing simple to advance levels or machine controls. 2. MEDIUM - have up to 2048 I/O’s and memories up to 32 Kbytes. 3. LARGE - the most sophisticated units of the PLC family. They have up to 8192 I/O’s and memories up to 750 Kbytes. - can control individual production processes or entire plant.
  • 10. Tank Used To Mix Two Liquids MOTOR A FS SOLENOIDS FLOAT SWITCH B SOLENOID C TIMER 1 -MINUTE
  • 11. SCADA Introduction (What Is SCADA?) Supervisory Control And Data Acquisition is an Industrial Control System.  To run a Process Control Network (PCN).  Monitors and controls industrial plant/ equipment.  E.g. water, energy, fuel, telecommunications.  Coordinate data transfer between Remote Terminal Units (RTUs) & central host.  Display information to operators.
  • 12. SCADA Components  Field Instrumentation.  Sensors, devices to control.  Remote Terminal Units. RTU Vs. PLC  Communications Network.  Equipment needed to transfer data to and from different sites  Central Monitoring Station  Collecting information gathered by the remote stations to generate the necessary action
  • 13. A Typical SCADA System 13
  • 14. Disadvantages Of Relay Systems  Relays used only for on/off control.  Complicated control systems  Expensive System.  System takes up much floor and space.  Control relays are power- hungry, heat generation.  Any change in control program requires the rewiring of relays.  For complicated control systems, it is difficult to troubleshoot and locate the faults.
  • 15. Advantages Of SCADA systems    Easily programmed or reprogrammed Easy maintained (self diagnostic). Capability to do arithmetic function.  The ability to communicate with other controller or a master host computer. PLCs. were able to move past simple on/off control to more complex schemes as PID control. 
  • 16. Applications Of SCADA Almost every business in the manufacturing sector and many in the service sector Aerospace Bottling and Canning Chemicals Plants Petroleum, Petrochemical
  • 17. Thank you